1.Sift flour with 1 cup of the sugar, the salt and baking powder. Set aside. In small bowl of electric mixer beat egg whites until they hold peaks but are not dry. Add 1/2 cup of the remaining sugar and beat well; set aside.

2.In large bowl of mixer add remaining 1/2 cup sugar to egg yolks, together with flavoring (lemon extract or vanilla). Beat until very thick and pale yellow.